VIENNA (Reuters) - Kazakhstan's former spy chief and a presidential family guard went on trial for murder in Austria on Tuesday just weeks after the main suspect, the president's former son-in-law, was found hanged in his cell in Vienna.

Austria had twice refused to extradite Rakhat Aliyev, a former Kazakh ambassador to Austria who became a vocal critic of President Nursultan Nazarbayev, and had been investigating the case for eight years. Aliyev turned himself in last June.